Salifert tests and light

Brett newell · Apr 2, 2018

Very sorry if this has been talked about before. I couldn't find anything on the subject. I was doing some water testing tonight sitting at the bar that's between the dining room and kitchen. AMD I noticed that the color was drastically different under different lights. I checked it with the kitchen light which is a low led, the dining room which is slightly brighter led and then thru the glass back door against sunlight. Looking out side the color would change 2 to 6 drops sooner depending on test as compared to the kitchen. So the question is, which one is more accurate? I was leaning towards the sunlight being the more accurate one. I did some searching for the answer and couldn't find anything. The only thing ove found is that it is important the the water level in the dripping syringe must be at .85.

Crabs McJones · Apr 2, 2018

Brett newell said:
Very sorry if this has been talked about before. I couldn't find anything on the subject. I was doing some water testing tonight sitting at the bar that's between the dining room and kitchen. AMD I noticed that the color was drastically different under different lights. I checked it with the kitchen light which is a low led, the dining room which is slightly brighter led and then thru the glass back door against sunlight. Looking out side the color would change 2 to 6 drops sooner depending on test as compared to the kitchen. So the question is, which one is more accurate? I was leaning towards the sunlight being the more accurate one. I did some searching for the answer and couldn't find anything. The only thing ove found is that it is important the the water level in the dripping syringe must be at .85.

I've seen that .85 thing and I cannot for the life of me understand it. What difference does it make if the solution is at 8.0 like a regular fill up or 8.5? You never empty the whole syringe and even if you do the measuring is made to compensate for the difference with the nozzle at 8.0 on a 1ml fill up.

Randy Holmes-Farley · Apr 2, 2018

The water level in the “full” syringe will depend n the tip used and to a lesser extent, how tight you push it on. Neither factor will impact the answer if you are using the syringe correctly.

With many kits, outdoor indirect light can make them easiest to see properly.